JP4527778B2 - Construction machinery drum rotating device - Google Patents

Description

  The present invention relates to a drum rotating device for a construction machine that is preferably used for a traveling device such as a hydraulic excavator or a hydraulic crane, a rope winch, or the like.

  In general, a traveling device of a construction machine such as a hydraulic excavator or a wheel loader is provided with a drum rotating device that rotates a drum to which a sprocket for driving a crawler belt is attached or a drum to which a wheel is attached. Further, a rope winch mounted on a hydraulic crane or the like is provided with a drum rotating device that rotates a drum that winds and unwinds the rope (for example, Japanese Patent Laid-Open No. 2000-9017, Japanese Patent Laid-Open No. Hei 1). No. 153840 and JP-A-60-183498).

  Here, the drum rotating apparatus according to the prior art includes a hydraulic motor serving as a driving source, a speed reducing mechanism that is provided on the inner peripheral side of the drum and decelerates the rotation of the hydraulic motor and transmits it to the drum, and an output shaft of the hydraulic motor. And a connecting shaft that connects the mechanism. The drum rotating device rotates the drum with a large torque by decelerating the rotation of the hydraulic motor by a reduction mechanism.

  Also, in this kind of drum rotating device, a negative type wet multi-plate which normally applies braking to the connecting shaft when the hydraulic motor is stopped and releases braking to the connecting shaft when the hydraulic motor is rotating. A brake is provided. The wet multi-plate brake is compactly disposed on the inner peripheral side of the drum together with the speed reduction mechanism, and is configured to reduce the size of the entire drum rotating device.

  By the way, the hydraulic motor used in the above-described conventional drum rotating apparatus rotates the output shaft by supplying and discharging pressure oil from a hydraulic pump driven by an engine. For this reason, when the drum rotating device is operated, there is a problem that the surrounding environment is contaminated by exhaust gas discharged from the engine and the working environment is lowered by noise generated when the engine is operated.

  On the other hand, a drum rotating device using an electric motor as a driving source instead of a hydraulic motor is known, and this drum rotating device drives an electric motor by supplying power from a power source such as a battery, thereby exhaust gas. And generation of noise can be suppressed (see, for example, JP-A-11-155256).

  Incidentally, in a drum rotating device using an electric motor, it is desirable to use a negative dry electromagnetic brake instead of a wet multi-plate brake in order to effectively use a power source such as a battery.

  However, in a drum rotating device using an electric motor, when lubricating oil is housed in the drum together with the speed reduction mechanism, the negative dry electromagnetic brake is isolated from the flammable lubricating oil. There is a problem that it is difficult to arrange in a compact manner on the inner peripheral side of the drum.

  The present invention has been made in view of the above-described problems of the prior art, and is a construction machine in which a negative dry electromagnetic brake can be compactly accommodated on the inner peripheral side of a drum in a state isolated from the lubricating oil. An object of the present invention is to provide a drum rotating device.

To solve the problems described above mentioned, the drum rotation device for a construction machine according to the present invention, the other side of the one side in the axial direction is open axial direction is formed in a cylindrical shape which is closed by a lid, of the construction machine A support member fixedly attached to the airframe, an electric motor provided on one side in the axial direction of the support member and rotating toward the support member by being supplied with power from the outside; The drum is formed in a cylindrical shape that is open on the other side and closed on the other side in the axial direction. A reduction mechanism that has one or a plurality of reduction stages accommodated in a state, and that is provided with a reduction mechanism that decelerates the input rotation and rotates the drum, and extends in the axial direction in the support member. One side is connected to the output shaft of the electric motor, and the axial direction The other side is rotatably supported by the lid portion of the support member and is connected to the speed reduction mechanism, and is housed in the support member and is connected when the electric motor is stopped. Liquid is applied between a negative dry electromagnetic brake that applies braking to the shaft and releases braking to the connecting shaft when the electric motor is rotating, and an opening at one end of the drum. A first seal member that tightly seals, and a second seal member that liquid-tightly seals between the lid portion of the support member and the connecting shaft, and the dry electromagnetic brake is disposed in an axial direction of the connecting shaft. It is characterized in that two are provided apart .

  With such a configuration, the space between the support member and the opening at one end of the drum is sealed by the first seal member, and the space between the lid portion of the support member and the connecting shaft is the second seal member. The negative dry electromagnetic brake housed in the support member can be isolated from the lubricating oil in the drum. Accordingly, the dry electromagnetic brake can be used to apply braking to the connecting shaft when the electric motor is stopped, and release the braking to the connecting shaft when the electric motor is rotating.

  In addition, the dry electromagnetic brake can be compactly accommodated in the support member to which the electric motor and the speed reduction mechanism are attached, while being isolated from the lubricating oil, so that the entire drum rotating device equipped with the dry electromagnetic brake can be reduced in size. Can be planned.

In addition, by providing two dry electromagnetic brakes spaced apart in the axial direction of the connecting shaft in the support member, a large braking force can be applied to the connecting shaft when the electric motor is stopped, and the drum is stopped reliably. I can leave it to you. In this case, since a space for heat dissipation is formed between the two dry electromagnetic brakes, even if heat is generated when the dry electromagnetic brake is energized, this heat can be efficiently radiated into the space. it can. As a result, the durability of the dry electromagnetic brake can be enhanced and the reliability of the drum rotating device can be enhanced.

Also, the invention of claim 2, wherein the two dry electromagnetic brake is characterized in that incorporated in the same direction toward the lid portion from one axial side of the opening in the support member.

  According to such a configuration, each of the two dry electromagnetic brakes can be assembled in the same direction from the opening on one side in the axial direction of the support member toward the lid, and can be mounted in the support member. Thereby, workability | operativity when attaching a dry electromagnetic brake to a support member can be improved.

Also, the invention of claim 3, wherein the connecting shaft is coupled with one side the coupling in the axial direction in which one side in the axial direction is spline portion is provided on the outer peripheral surface is connected to an output shaft of the electric motor The dry electromagnetic brake meshes with the spline portion of the coupling and rotates integrally with the coupling; and A non-rotating plate that is provided so as to be movable in the axial direction of the coupling and frictionally engages with the rotating plate, and an electromagnetic coil that releases the frictional engagement between the non-rotating plate and the rotating plate by external power supply. It is characterized by that.

  Thus, by configuring the connecting shaft that connects the output shaft of the electric motor and the speed reduction mechanism with the coupling and the input shaft, for example, in a state where the input shaft is connected to the speed reduction mechanism, The output shaft of the electric motor can be easily connected by coupling. As a result, workability when connecting the output shaft of the electric motor and the speed reduction mechanism can be improved.

Hand, the invention of claim 4, wherein the inside support member, provided the support member on than the dry electromagnetic brake in a state attached to the machine body, a connector housing portion in a portion which is a lower direction of the upper, The connector accommodating portion accommodates a connector for connecting an internal wiring connected to the dry electromagnetic brake to an external wiring.

  With this configuration, even if rainwater or the like enters the support member from the attachment site between the support member and the electric motor, the rainwater or the like can be prevented from adhering to the connector, and the reliability of the electromagnetic brake can be improved. it can.

Et al is, the invention of claim 5, wherein the body is a track frame constituting the undercarriage of the crawler type vehicle, provided to fix the sprocket meshing with the track on the outer side of the drum, the electric The motor and the speed reduction mechanism are characterized by being accommodated within the width of the crawler belt.

  As described above, when the drum rotating device is applied to a traveling device for a tracked vehicle, the electric motor and the speed reduction mechanism can be prevented from protruding outward from the crawler belt. As a result, even when the tracked vehicle travels on rough terrain or the like, the electric motor and the speed reduction mechanism can be protected from obstacles such as rocks, and the reliability of the traveling device can be improved.

FIG. 1 is a front view showing a hydraulic excavator in which the drum rotating device according to the first embodiment is applied to a traveling device. FIG. 2 is an external view showing a track frame, a traveling device, and the like of the hydraulic excavator. FIG. 3 is a cross-sectional view showing the traveling device in FIG. FIG. 4 is an enlarged cross-sectional view showing main parts such as a support member, an electric motor, a planetary gear speed reduction mechanism, and a dry electromagnetic brake. FIG. 5 is a cross-sectional view showing a state where the dry electromagnetic brake applies a braking force to the output shaft. FIG. 6 is a cross-sectional view showing a state in which the dry electromagnetic brake releases the braking on the output shaft. FIG. 7 is an enlarged sectional view similar to FIG. 4 showing a traveling device to which the drum rotating device according to the second embodiment of the present invention is applied. FIG. 8 is a cross-sectional view similar to FIG. 5, showing the main part of the third embodiment of the present invention.

  Hereinafter, the embodiment of the drum rotating device for a construction machine according to the present invention will be described in detail with reference to FIGS. 1 to 8 by taking as an example a case where the drum rotating device is applied to a traveling device of an electric hydraulic excavator.

  First, FIG. 1 to FIG. 6 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes an electric excavator. The electric excavator 1 includes a self-propelled lower traveling body 2 and an upper revolving body described later provided on the lower traveling body 2 so as to be rotatable. 7 is roughly constituted.

  Here, the lower traveling body 2 has a track frame 3 constituted by a center frame 3A and left and right side frames 3B, and the track frame 3 constitutes the body of the excavator 1 in the present embodiment. To do. A sprocket 4 is provided on the rear end side of each side frame 3B, and an idler 5 is provided on the front end side of each side frame 3B. A crawler belt 6 forming an endless track is formed between the sprocket 4 and the idler 5. It is wound.

  Further, as shown in FIGS. 1 and 3, a bracket 3C for attaching a support member 12 described later is provided on the rear end side of the side frame 3B, and an electric motor described later is provided on the outer peripheral side of the bracket 3C. A motor cover 3D that covers the motor 14 is provided.

Reference numeral 7 denotes an upper swing body provided on the lower traveling body 2, and the upper swing body 7 is roughly constituted by a building 8 and a cab 9. Here, the building 8, a revolving frame 8A mounted pivotably on the track frame 3, provided on the revolving frame 8A, battery, motor, hydraulic pump, hydraulic oil tank, etc. (none shown ) And a building cover 8B for housing the housing. The cab 9 is provided on the left side of the front portion of the turning frame 8A and defines a cab.

  Reference numeral 10 denotes a working device provided on the front side of the upper swing body 7 so as to be able to move up and down. The working device 10 includes a boom 10A whose base end is pin-coupled to the revolving frame 8A, an arm 10B pin-coupled to the distal end of the boom 10A, a bucket 10C pin-coupled to the distal end of the arm 10B, and a boom cylinder. 10D, arm cylinder 10E, bucket cylinder 10F, and the like.

  And by excavating pressure oil to each cylinder 10D, 10E, 10F of the working device 10 from a hydraulic pump (not shown) accommodated in the building cover 8B, the working device 10 excavates earth and sand. It is the composition which performs etc.

  Reference numeral 11 denotes a traveling device for the lower traveling body 2 applied as a representative example of the drum rotating device according to the present embodiment. The traveling device 11 is provided on each of the left and right side frames 3 </ b> B constituting the track frame 3. As shown in FIGS. 3 and 4, the traveling device 11 includes a support member 12, an electric motor 14, a drum 15, a planetary gear reduction mechanism 21, a dry electromagnetic brake 30, and the like which will be described later.

  Reference numeral 12 denotes a support member fixedly provided on the side frame 3B of the track frame 3 serving as an airframe, and the support member 12 is a step extending in the axial direction (left and right directions) as shown in FIGS. It is formed in a covered cylinder with a lid. Here, the support member 12 has a cylindrical portion 12A extending in the axial direction, one side in the axial direction of the cylindrical portion 12A becomes an opening portion 12B, and an annular flange portion 12C is provided around the opening portion 12B. It has been. As shown in FIGS. 3 and 4, the flange portion 12 </ b> C of the support member 12 is fixed to the bracket 3 </ b> C protruding from the rear end side of the side frame 3 </ b> B using a bolt 13. On the other hand, the other axial side of the cylindrical portion 12A is closed as a lid portion 12D, and a shaft insertion hole 12E through which an input shaft 28 (described later) is inserted is formed in the center portion of the lid portion 12D (see FIG. 5).

  Further, a brake accommodating portion 12F for accommodating a later-described dry electromagnetic brake 30 is provided on the inner peripheral side of the cylindrical portion 12A. Further, a connector accommodating portion 12G for accommodating a connector 41 described later is provided at a position above and below the dry electromagnetic brake 30 with the support member 12 attached to the track frame 3. Further, a spline portion 12H is formed on the outer peripheral surface on the other axial side of the cylindrical portion 12A. The spline portion 12H engages with a carrier 25C of a planetary gear reduction mechanism 21 described later.

  Reference numeral 14 denotes an electric motor for traveling attached to the opening 12B side which is one side in the axial direction of the support member 12. Here, as shown in FIG. 3, the electric motor 14 is integrally supported on an output shaft 14B that is rotatably supported by the motor casing 14A and extends in the axial direction within the support member 12, and an outer peripheral side of the output shaft 14B. It is comprised by the AC electric motor provided with the provided rotor 14C and the stator 14D arrange | positioned at the outer peripheral side of the rotor 14C.

  And the electric motor 14 rotates the output shaft 14B by the electric power converted into alternating current supplied from the battery accommodated in the building cover 8B via an inverter (none is shown) etc. (electric power feeding). Is. A terminal box 14E is attached to the upper part of the motor casing 14A, and the electric motor 14 including the terminal box 14E is covered with a motor cover 3D of the bracket 3C.

  Reference numeral 15 denotes a drum rotatably provided on the outer peripheral side of the support member 12. As shown in FIGS. 3 and 4, the drum 15 is formed in a stepped covered cylindrical shape as a whole. Here, the drum 15 has a cylindrical shape having a large-diameter cylindrical body 16 having an opening 16A on one side in the axial direction, and an internal gear 17A formed on the inner peripheral side of the cylindrical body 16 on the other axial side. Ring gear 17 and a disc-shaped lid 18 that liquid-tightly closes the other axial side of the ring gear 17.

  A plurality of bearings 19 are provided between the opening 16 </ b> A of the cylindrical body 16 and the outer peripheral surface of the cylindrical portion 12 </ b> A of the supporting member 12. It is rotatably supported on the outer periphery of the. An annular flange 16B is provided around the opening 16A of the cylindrical body 16, and the sprocket 4 is fixed to the flange 16B using a plurality of bolts 20.

  Reference numeral 21 denotes a planetary gear reduction mechanism housed in the drum 15. The planetary gear reduction mechanism 21 decelerates the rotation of the output shaft 14B of the electric motor 14 and transmits it to the drum 15, which causes the drum 15 to rotate at a low speed with high torque. Rotate with. Here, as shown in FIG. 4, the planetary gear speed reduction mechanism 21 is configured by three-stage planetary gear mechanisms 23, 24, and 25, which will be described later, and is immersed in the lubricating oil 22 held in the drum 15. Thereby, the planetary gear speed reduction mechanism 21 is constantly lubricated by the lubricating oil 22 and is configured to operate smoothly over a long period of time.

  Reference numeral 23 denotes a first-stage planetary gear mechanism. The planetary gear mechanism 23 includes a sun gear 23B integrally formed with a shaft portion 23A extending in the axial direction in the ring gear 17, and the sun gear 23B and the internal gear 17A of the ring gear 17. And a plurality of planetary gears 23C that revolve while rotating around the sun gear 23B, and a carrier 23D that rotatably supports the planetary gears 23C via pins or the like.

  24 is a planetary gear mechanism of the second stage, and the planetary gear mechanism 24 meshes with the sun gear 24A spline-coupled to the carrier 23D of the first stage, the sun gear 24A, and the internal gear 17A of the ring gear 17, A plurality of planetary gears 24B that revolve while rotating around the sun gear 24A, and a carrier 24C that rotatably supports the planetary gears 24B via pins or the like.

  Reference numeral 25 denotes a third-stage planetary gear mechanism which is the final stage. The planetary gear mechanism 25 includes a sun gear 25A splined to the second-stage carrier 24C, and the sun gear 25A and the internal gear 17A of the ring gear 17. A plurality of planetary gears 25B meshing with each other, and a carrier 25C that rotatably supports each planetary gear 25B via a pin or the like. Here, the carrier 25 </ b> C is fixed in the rotational direction with respect to the support member 12 by meshing with a spline portion 12 </ b> H formed on the outer peripheral surface on the other axial side of the support member 12.

  As a result, the third-stage planetary gear mechanism 25 is configured to transmit only the rotation of each planetary gear 25B to the drum 15. Thus, the planetary gear reduction mechanism 21 reduces the rotation of the output shaft 14B of the electric motor 14 by three stages by the planetary gear mechanisms 23, 24, and 25 of each stage, and transmits this reduced rotation to the ring gear 17 of the drum 15. To do. Thereby, the drum 15 is configured to rotate with a large torque.

  Reference numeral 26 denotes a connecting shaft provided extending in the axial direction in the support member 12, and the connecting shaft 26 connects the output shaft 14 </ b> B of the electric motor 14 and the planetary gear reduction mechanism 21. Here, as shown in FIGS. 4 and 5, the connecting shaft 26 includes a coupling 27 described later and an input shaft 28.

  Reference numeral 27 denotes a cylindrical coupling in which one side in the axial direction is connected to the output shaft 14 </ b> B of the electric motor 14, and a male spline 27 </ b> A is formed on the outer peripheral surface of the coupling 27. Here, the output shaft 14B of the electric motor 14 is spline-coupled to the inner peripheral surface on one axial side of the coupling 27, and a rotary plate 36 of a dry electromagnetic brake 30 to be described later is connected to the male spline 27A of the coupling 27. Is configured to mesh.

  28 is an input shaft whose one side in the axial direction is splined to the inner peripheral surface of the coupling 27, and the other side in the axial direction of the input shaft 28 is a shaft insertion hole 12E formed in the lid portion 12D of the support member 12. Is inserted. Here, a plurality of bearings 29 are provided between the input shaft 28 and the shaft insertion hole 12 </ b> E of the support member 12, and the input shaft 28 is rotatably supported by the lid portion 12 </ b> D of the support member 12 via each bearing 29. Has been. A shaft portion 23A integrally formed with the sun gear 23B constituting the first stage planetary gear mechanism 23 is splined to the other axial side of the input shaft 28.

  Reference numerals 30 and 30 denote two dry electromagnetic brakes provided in the support member 12 so as to be separated from each other in the axial direction. Each of these dry electromagnetic brakes 30 functions as a parking brake (negative brake) of the excavator 1. That is, each dry electromagnetic brake 30 applies a braking force to the output shaft 14B when the electric motor 14 is stopped, and releases the braking to the output shaft 14B when the electric motor 14 operates.

  Here, as shown in FIGS. 5 and 6, each dry electromagnetic brake 30 is positioned on the outer peripheral side of the coupling 27 and is accommodated in a brake accommodating portion 12 </ b> F of the support member 12, and a yoke member 31 described later is fixed. It comprises a plate 33, a rotating plate 36, a non-rotating plate 37, an electromagnetic coil 39, and the like.

  Reference numeral 31 denotes a yoke member that serves as a base of the dry electromagnetic brake 30. The yoke member 31 is formed in a thick disk shape having a shaft insertion hole 31A drilled in the center using, for example, a magnetic material. In this case, the yoke member 31 of each dry electromagnetic brake 30 is incorporated in the brake accommodating portion 12F of the support member 12 in the same direction from the opening 12B toward the lid portion 12D, and a plurality of bolts 32 (only one) is provided. It is fixed using the figure. A coupling 27 of the connecting shaft 26 is inserted into the shaft insertion hole 31A of the yoke member 31 with a gap.

  The yoke member 31 is formed with an annular concave portion 31B concentric with the shaft insertion hole 31A, and an electromagnetic coil 39 described later is accommodated in the concave portion 31B. Further, the yoke member 31 is provided with a plurality of bottomed holes 31C (only one is shown) extending in the axial direction, and a coil spring 38 to be described later is held in the bottomed hole 31C.

  Reference numeral 33 denotes a fixing plate fixed to the yoke member 31. The fixing plate 33 is formed in a hollow disk shape, and a coupling 27 is inserted through the inner periphery thereof. The fixing plate 33 is fixed to the yoke member 31 using a plurality of bolts 34 and a cylindrical guide 35 (only one is shown) spaced in the circumferential direction. In this case, each bolt 34 is fixed to the yoke member 31 by screwing the tip end side to the yoke member 31 while being inserted into the guide 35.

  A rotating plate 36 meshes with the male spline 27 A of the coupling 27, and the rotating plate 36 is disposed between the yoke member 31 and the fixed plate 33. Here, the rotating plate 36 is formed in a hollow disc shape, and a female spline 36A is formed on the inner peripheral side thereof. The rotating plate 36 is configured to rotate integrally with the coupling 27 by engaging the female spline 36 </ b> A with the male spline 27 </ b> A of the coupling 27.

  Reference numeral 37 denotes a non-rotating plate positioned between the yoke member 31 and the fixed plate 33 so as to be movable in the axial direction of the coupling 27. The non-rotating plate 37 is formed in a hollow disc shape, A coupling 27 is inserted on the circumferential side. The non-rotating plate 37 sandwiches the rotating plate 36 with the fixed plate 33. Here, the non-rotating plate 37 is held in a non-rotating state with respect to the coupling 27 by inserting the guide 35 on the outer peripheral side thereof, and only moves in the axial direction of the coupling 27 along the guide 35. Is allowed.

  Reference numeral 38 denotes a coil spring provided in a plurality of bottomed holes 31C (only one is shown) formed in the yoke member 31. The coil spring 38 constantly presses the non-rotating plate 37 toward the fixed plate 33. is doing. When no power is supplied to the electromagnetic coil 39, the non-rotating plate 37 pressed by the coil spring 38 is frictionally engaged with the rotating plate 36 as shown in FIG. Is regulated. As a result, a braking force can be applied to the output shaft 14B of the electric motor 14 connected to the rotating plate 36 via the coupling 27.

  Reference numeral 39 denotes an electromagnetic coil housed in the recessed portion 31B of the yoke member 31. The electromagnetic coil 39 is excited, for example, by being supplied with power to the electric motor 14 at the same time, and magnetically moves the non-rotating plate 37. Adsorb. As a result, as shown in FIG. 6, the non-rotating plate 37 is separated from the rotating plate 36 against the spring force of the coil spring 38, and the frictional engagement between the non-rotating plate 37 and the rotating plate 36 is released. Thus, the braking of the output shaft 14B of the electric motor 14 is released.

  Reference numeral 40 denotes a space formed in the brake accommodating portion 12F of the support member 12, and the space 40 is formed between two dry electromagnetic brakes 30 that are spaced apart in the axial direction. The heat generated when the electromagnetic coil 39 of each dry electromagnetic brake 30 is excited can be dissipated into the space 40.

  Further, the two dry electromagnetic brakes 30 are located between the electric motor 14 and the planetary gear reduction mechanism 21 and are accommodated in the support member 12. As a result, as shown in FIG. 3, the electric motor 14 and the planetary gear speed reduction mechanism 21 can be accommodated within the lateral width (crawler belt width) dimension S of the crawler belt 6.

  Reference numeral 41 denotes a connector housed in the connector housing portion 12G of the support member 12, and the connector 41 includes a brake side socket 41A and a power source side socket 41B. Here, the brake side socket 41 </ b> A is attached to the tip of the internal wiring 42 connected to the electromagnetic coil 39. Moreover, the power supply side socket 41B is attached to the front-end | tip of the external wiring 43 connected to the power supply (not shown). And the connector 41 connects the electromagnetic coil 39 of the dry electromagnetic brake 30 to a power supply by connecting the brake side socket 41A and the power supply side socket 41B.

  In this case, the connector housing portion 12 </ b> G of the support member 12 is provided at a site that is above and below the dry electromagnetic brake 30. Therefore, by housing the connector 41 in the connector housing portion 12G, even if rainwater or the like enters the support member 12 from the attachment portion of the support member 12 and the electric motor 14, the rainwater or the like adheres to the connector 41. It is the structure which can suppress this.

  Reference numeral 44 denotes a floating seal serving as a first seal member for liquid-tightly sealing between the opening 16A of the cylindrical body 16 constituting the drum 15 and the support member 12. As shown in FIG. 4 and the like, the floating seal 44 is provided in an annular shape over the entire circumference between the opening 16 </ b> A and the support member 12. The floating seal 44 seals between the fixed support member 12 and the rotating drum 15, and seals the lubricating oil 22 that lubricates the bearing 19, the planetary gear reduction mechanism 21, etc. in the drum 15. is there.

  Reference numeral 45 denotes a U-shaped seal ring as a second seal member for liquid-tightly sealing between the lid portion 12D of the support member 12 and the connecting shaft 26. The seal ring 45 is provided between the shaft insertion hole 12E formed in the lid portion 12D and the input shaft 28 of the connecting shaft 26. The seal ring 45 seals between the shaft insertion hole 12E and the input shaft 28, so that the lubricating oil 22 held in the drum 15 flows into the brake accommodating portion 12F of the support member 12. It is a deterrent.

  The traveling device 11 of the hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described below.

  First, when the electric power is not supplied to the electric motor 14 of the traveling device 11 and the electric motor 14 is stopped, the electric power is not supplied to the electromagnetic coil 39 of each dry electromagnetic brake 30. In this case, as shown in FIG. 5, the non-rotating plate 37 is pressed by the coil spring 38 to sandwich the rotating plate 36 with the fixed plate 33, and is frictionally engaged with the rotating plate 36. . Thereby, since rotation of the rotating plate 36 is regulated, a braking force can be applied to the output shaft 14B of the electric motor 14 connected to the rotating plate 36 via the coupling 27, and this can be applied to the hydraulic excavator 1. It can be operated as a parking brake (negative brake).

  On the other hand, when power is supplied to the electric motor 14 of the traveling device 11 in order to drive the hydraulic excavator 1, power is also supplied to the electromagnetic coil 39 of each dry electromagnetic brake 30 via the connector 41 and the like. In this case, when the electromagnetic coil 39 is excited, the non-rotating plate 37 is magnetically attracted to the electromagnetic coil 39 against the spring force of the coil spring 38 as shown in FIG. For this reason, the frictional engagement between the non-rotating plate 37 and the rotating plate 36 is released, and the braking of the output shaft 14B of the electric motor 14 can be released.

  As a result, the output shaft 14B of the electric motor 14 rotates, and the rotation of the output shaft 14B is transmitted to the drum 15 while being decelerated by three stages by the planetary gear reduction mechanism 21. As a result, the sprocket 4 fixed to the cylindrical body 16 of the drum 15 rotates with a large torque integrally with the drum 15, and the crawler belt 6 meshing with the sprocket 4 is driven to rotate around the idler 5. The hydraulic excavator 1 travels.

  Thus, according to the present embodiment, the space between the support member 12 and the opening 16A of the drum 15 (cylindrical body 16) is liquid-tightly sealed by the floating seal 44, and the shaft provided on the lid portion 12D of the support member 12 is provided. The space between the insertion hole 12E and the connecting shaft 26 (input shaft 28) is sealed in a liquid-tight manner by a seal ring 45. Thus, the two dry electromagnetic brakes 30 can be accommodated in the support member 12 in a state of being isolated from the flammable lubricating oil 22 accommodated in the drum 15. Therefore, the dry electromagnetic brake 30 can be used to apply braking to the connecting shaft 26 when the electric motor 14 is stopped, and release the braking to the connecting shaft 26 when the electric motor 14 is rotating.

  Further, since each dry electromagnetic brake 30 can be compactly accommodated in the support member 12 to which the electric motor 14 and the planetary gear speed reduction mechanism 21 are attached, the entire traveling device 11 including the dry electromagnetic brake 30 is reduced in size. Can be

  Thus, as shown in FIG. 3, the electric motor 14 and the planetary gear reduction mechanism 21 can be accommodated within the lateral width (crawler belt width) dimension S of the crawler belt 6, and the electric motor 14 or the planetary gear reduction mechanism 21 can be It is possible to suppress overhanging from 6 to the outside. Therefore, when the excavator 1 travels on rough terrain or the like, the electric motor 14 and the planetary gear reduction mechanism 21 can be protected from obstacles such as rocks, and the reliability of the traveling device 11 can be improved.

  Further, by using the electric motor 14 for the traveling device 11, for example, an engine for driving the hydraulic pump can be made unnecessary as compared with a case where a hydraulic motor driven by pressure oil from the hydraulic pump is used. . Accordingly, it is possible to suppress the occurrence of exhaust gas, noise, and the like due to the engine when the hydraulic excavator 1 travels, and it is possible to maintain a favorable working environment.

  In the present embodiment, two dry electromagnetic brakes 30 are provided in the brake accommodating portion 12F of the support member 12 so as to be separated in the axial direction. Thereby, when the electric motor 14 is stopped, a large braking force can be applied to the output shaft 14B by the two dry electromagnetic brakes 30, and the excavator 1 is stopped (parked) with certainty. I can leave.

  Moreover, by forming the space 40 between the two dry electromagnetic brakes 30, even if heat is generated when the electromagnetic coil 39 of each dry electromagnetic brake 30 is excited, this heat is efficiently transferred into the space 40. It can dissipate heat. Thereby, the durability of the dry electromagnetic brake 30 can be enhanced, and the reliability of the traveling device 11 can be enhanced.

  Further, since the two dry electromagnetic brakes 30 are fixed to the support member 12 respectively, the electric motor 14 is attached to the support member 12 in a state where the dry electromagnetic brakes 30 are incorporated in the support member 12 in advance. The workability at the time of assembly can be improved.

  In this case, the two dry electromagnetic brakes 30 are assembled in the same direction from the opening 12 </ b> B toward the lid 12 </ b> D in the brake accommodating portion 12 </ b> F of the support member 12, and are fixed using a plurality of bolts 32. . As a result, the assembling directions of the dry electromagnetic brakes 30 can be made common, and the workability when assembling these dry electromagnetic brakes 30 to the support member 12 can also be improved.

  In addition, a connecting shaft 26 that connects between the output shaft 14 </ b> B of the electric motor 14 and the planetary gear reduction mechanism 21 is constituted by a coupling 27 and an input shaft 28. Thereby, for example, in a state where the input shaft 28 is connected to the planetary gear reduction mechanism 21, the input shaft 28 and the output shaft 14B of the electric motor 14 can be easily connected by the coupling 27, and the workability is improved. be able to.

  Further, in the support member 12, a connector housing portion 12 </ b> G is provided at a site above the dry electromagnetic brake 30. And in this connector accommodating part 12G, the connector 41 which connects the internal wiring 42 connected to the electromagnetic coil 39 of the dry electromagnetic brake 30 and the external wiring 43 for electric power feeding is accommodated. As a result, even if rainwater or the like enters the support member 12 from the attachment portion of the support member 12 and the electric motor 14, the rainwater or the like can be prevented from adhering to the connector 41, and the reliability of the dry electromagnetic brake 30 can be suppressed. Can increase the sex.

  Next, FIG. 7 shows a second embodiment of the present invention. The feature of this embodiment is that one of two electromagnetic brakes provided in the support member is attached to the support member, and the other is an electric motor. It is in having installed in. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 51 denotes a traveling device to which the drum rotating device according to the present embodiment is applied. The traveling device 51 is substantially the same as the traveling device 11 according to the first embodiment described above. The motor 14, the drum 15, the planetary gear speed reduction mechanism 21, two dry electromagnetic brakes 30 and 52, and the like are included.

  However, the point that one dry electromagnetic brake 30 is attached to the support member 12 and the other dry electromagnetic brake 52 is attached to the motor casing 14A of the electric motor 14 is different from the first embodiment.

  Reference numeral 52 denotes a dry electromagnetic brake provided in the brake accommodating portion 12F of the support member 12 together with the dry electromagnetic brake 30. The dry electromagnetic brake 52 is similar to the dry electromagnetic brake 30 in that the yoke member 31, the fixing plate 33, and the guide 35 are provided. , A rotating plate 36, a non-rotating plate 37, a coil spring 38, an electromagnetic coil 39, and the like.

  Then, a plurality of bolts 53 (only one is shown) are inserted into the fixing plate 33, the guide 35, and the yoke member 31, and each bolt 53 is screwed to the motor casing 14 </ b> A of the electric motor 14, whereby the dry electromagnetic brake 52. Is fixed in the support member 12.

  The traveling device 51 according to the present embodiment has the above-described configuration, and the operation thereof is not particularly different from that according to the first embodiment described above.

  However, according to the present embodiment, one of the two dry electromagnetic brakes 30 and 52 provided in the support member 12 is attached to the support member 12, and the other dry electromagnetic brake 52 is connected to the electric motor. Therefore, a large space 54 can be formed between the dry electromagnetic brakes 30 and 52, and the heat radiation of each dry electromagnetic brake 30 and 52 can be further promoted.

  Next, FIG. 8 shows a third embodiment of the present invention, and the feature of this embodiment is that a connecting shaft that connects between the output shaft of the electric motor and the speed reduction mechanism is constituted by a single member. There is. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, 61 is a connecting shaft provided extending in the axial direction in the support member 12, and the connecting shaft 61 connects the output shaft 14 </ b> B of the electric motor 14 and the planetary gear reduction mechanism 21. is there. Here, the connecting shaft 61 is configured as a single member in which one side in the axial direction is the coupling portion 61A and the other side in the axial direction is the input shaft portion 61B.

  The coupling portion 61A is connected to the output shaft 14B of the electric motor 14, and a male spline 61C that engages the rotating plate 36 of the dry electromagnetic brake 30 is formed on the outer peripheral surface of the coupling portion 61A. The input shaft portion 61B is splined to the shaft portion 23A of the first stage planetary gear mechanism, and is rotatably supported by the lid portion 12D of the support member 12 via a bearing 29.

  The present embodiment includes a connecting shaft 61 in which the coupling portion 61A and the input shaft portion 61B are integrally formed as described above, and the other configurations are the same as those according to the first embodiment. .

  In each of the above-described embodiments, the case where the planetary gear reduction mechanism 21 with three-stage reduction is used is taken as an example. However, the present invention is not limited to this. For example, a planetary gear speed reduction mechanism having one speed reduction, two speed reduction, or four or more speed reduction stages may be used.

Further, in each of the above-described embodiments, the traveling devices 11 and 51 of the excavator 1 are described as examples of the drum rotating device. However, the present invention is not limited to this, and can be applied to, for example, a rope winch device mounted on a hydraulic crane. In this case, the drum may be configured as a winding drum for winding the rope around the outer periphery thereof.

3 Track frame
4 Sprocket
6 tracks
11, 51 traveling device
12 Support members
12F Brake compartment
12G connector housing
14 Electric motor
14B output shaft
15 drums
21 Planetary gear reduction mechanism
26,61 connecting shaft
27 Coupling
27A Male spline
28 Input shaft
30,52 Dry electromagnetic brake
36 Rotating plate
36A female spline
37 Non-rotating plate
39 Electromagnetic coil
41 connector
42 Internal wiring
43 External wiring
44 Floating seal (first seal member)
45 Seal ring (second seal member)
61A Coupling part
61B Input shaft

Claims (5)

A support member that is formed in a cylindrical shape that is closed on one side in the axial direction and closed on the other side in the axial direction, and fixed to the machine body of the construction machine;
An electric motor which is provided on one side in the axial direction of the support member and rotates an output shaft extending toward the support member by being supplied with power from outside;
A drum in which one side in the axial direction is opened and the other side in the axial direction is closed, and the one side in the axial direction is rotatably supported on the outer periphery of the support member via a bearing;
A reduction mechanism that has one or a plurality of reduction stages accommodated in the drum soaked in lubricating oil, decelerates the input rotation, and rotates the drum;
The support member is provided so as to extend in the axial direction, one side in the axial direction is connected to the output shaft of the electric motor, the other side in the axial direction is rotatably supported by the lid portion of the support member, and the deceleration is performed. A connecting shaft connected to the mechanism;
A negative type that is housed in the support member and applies braking to the connecting shaft when the electric motor is stopped, and releases braking to the connecting shaft when the electric motor is rotating. With a dry electromagnetic brake,
A first seal member for liquid-tightly sealing between the support member and an opening at one end of the drum;
A second seal member for liquid-tightly sealing between the lid portion of the support member and the connecting shaft;
A drum rotating device for a construction machine, wherein two dry electromagnetic brakes are provided apart from each other in the axial direction of the connecting shaft.   2. The drum rotating device for a construction machine according to claim 1, wherein the two dry electromagnetic brakes are incorporated into the support member in the same direction from an opening on one side in the axial direction toward the lid. 3. The coupling shaft has a coupling in which one side in the axial direction is connected to the output shaft of the electric motor and a spline portion is provided on the outer peripheral surface, and one side in the axial direction is connected to the coupling, and the other side in the axial direction is the deceleration. An input shaft coupled to the mechanism,
The dry electromagnetic brake includes a rotating plate that meshes with a spline portion of the coupling and rotates integrally with the coupling, and a non-rotating plate that is provided so as to be movable in the axial direction of the coupling and frictionally engages with the rotating plate. When construction machine drum rotating apparatus according to claim 1 or 2, characterized in that an electromagnetic coil for releasing the frictional engagement between the rotating plate and the non-rotating plate by the power supply from the outside. In the support member, a connector housing portion is provided at a position above and below the dry electromagnetic brake with the support member attached to the airframe, and the connector housing portion includes the dry electromagnetic The drum rotating device for a construction machine according to claim 1 or 2 , wherein a connector for connecting the internal wiring connected to the brake to the external wiring is accommodated. The airframe is a track frame that forms a lower traveling body of a tracked vehicle, and a sprocket that meshes with a crawler belt is fixedly provided on an outer peripheral side of the drum, and the electric motor and the speed reduction mechanism include the crawler belt The drum rotating device for a construction machine according to claim 1 or 2 , wherein the drum rotating device falls within a width dimension.

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